zFor a specific chord angle, a circle or arc always has the same number of chords, regardless of its size. For example, for the default chord angle, a circle is always composed of 72 chords (360°/5° per chord = 72 chords). This results in larger circles appearing less smooth than smaller circles with the same chord angle; setting the chord angle to a smaller number will help large circles or arcs appear more smooth (see Figure 20-8).

Figure 20-8 Changing Arc Smoothness with the Chord Angle

Table 20-6 Example: Varying the Chord Angle

ECE

Reset the printer.

EC%ØB

Enter HP-GL/2 mode.

IN;

Initialize HP-GL/2 mode.

 

 

SP1;

Select pen number 1. Even though there is no

 

physical pen, the SP command must be used to

 

enable printing.

 

 

PA2000,0;

Specify (2000,0) as the starting point.

 

 

PD;AA0,0,45,25;

With the pen down, draw a 45° arc (positive

 

angle) with center coordinates of (0,0) and a

 

chord angle of 25°.

 

 

PU1050,1060;

Lift the pen and move to (1050,1060).

 

 

PD;AA0,0,-45,10;

With the pen down, draw a 45° arc (negative

 

angle) using the same center point as the first

 

arc, but with a 10° chord angle.

 

 

EN

AA, Arc Absolute 20-11

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Image 471
HP 5961-0509 manual SP1 Select pen number 1. Even though there is no, Enable printing
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